A1388 and A1389: Linear Hall-Effect Sensor ICs with Analog Output Available in Miniature, Low-Profile Surface-Mount and SIP Packages

New applications for linear output Hall-effect sensors—such as displacement and angular position—require higher accuracy and smaller package sizes. The Allegro A1388 and A1389 linear Hall-effect sensor ICs have been designed specifically to meet both requirements. These temperature-stable devices are available in both surface-mount and through–hole packages.

The accuracy of each device is enhanced via end-of-line optimization. Each device features non-volatile memory to optimize device sensitivity and the quiescent voltage output (QVO: output in the absence of a magnetic field) for a given application or circuit. This A1388 and A1389 optimized performance is sustained across the full operating temperature range by programming the temperature coefficient for both sensitivity and QVO at Allegro end-of-line test.

These ratiometric Hall-effect sensor ICs provide a voltage output that is proportional to the applied magnetic field. The quiescent voltage output is adjusted around 50% of the supply voltage.

The features of these linear devices make them ideal for use in automotive and industrial applications requiring high accuracy, and they operate across an extended temperature range, –40°C to 150°C.

Each BiCMOS monolithic circuit integrates a Hall element, temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, a clamped low-impedance output stage, and a proprietary dynamic offset cancellation technique.

The A1388 and A1389 sensor ICs are offered in two package styles. The LH is a SOT-23W style miniature low–profile package for surface-mount applications. The UA is a 3-pin ultramini single inline package (SIP) for through-hole mounting. Both packages are lead (Pb) free, with 100% matte–tin leadframe plating.

• 5.0 V supply operation
• QVO temperature coefficient programmed at Allegro™ for improved accuracy
• Miniature package options
• High-bandwidth, low-noise analog output
• High-speed chopping scheme minimizes QVO drift across operating temperature range
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short-circuit diagnostic capabilities
• Undervoltage lockout (UVLO)
• Wide ambient temperature range: –40°C to 150°C
• Immune to mechanical stress
• Enhanced EMC performance for stringent automotive applications